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Spacing uniformity - Yield effects and in-field measurement

Citation

McPhee, JE and Beattie, B and Corkrey, R and Fennell, JFM, Spacing uniformity - Yield effects and in-field measurement, American Potato Journal, 73, (4) pp. 167-171. ISSN 0003-0589 (1996) [Refereed Article]

DOI: doi:10.1007/BF02853075

Abstract

Trials were done to investigate the effects of spacing uniformity on crop yield, and to assess a method of measuring spacing uniformity without the need to calculate the coefficient of variation. Spacing uniformities ranged from perfect to the worst observed in a previous field survey. Improved spacing uniformity gave increased marketable yields, with an improvement of 10% in gross return over the worst uniformity treatment. Such improvements are possible in commercial situations with proper attention to equipment maintenance and calibration and uniformity of seed piece size.

Spacing uniformity is often measured by the coefficient of variation, which is derived from the mean and standard deviation of measured seed piece or plant spacings. This is not the best method to use, since the measure of uniformity is referenced to the actual spacing, not the desired or target spacing. The alternative method of assessing spacing uniformity involved counting the number of spaces that lie in a pre-determined "acceptable range" and calculating the percentage of "acceptable spaces". The necessary calculations are easy if a suitable number (e.g. 40 or 50) of seed piece spaces are used.

The alternative method of assessing spacing uniformity involved counting the number of spaces that lie in a pre-determined "acceptable range" and calculating the percentage of "acceptable spaces". The necessary calculations are easy if a suitable number (e.g. 40 or 50) of seed piece spaces are used.

Item Details

Item Type:Refereed Article
Research Division:Engineering
Research Group:Other Engineering
Research Field:Agricultural Engineering
Objective Division:Plant Production and Plant Primary Products
Objective Group:Horticultural Crops
Objective Field:Vegetables
Author:McPhee, JE (Mr John McPhee)
Author:Beattie, B (Mr Bruce Beattie)
Author:Corkrey, R (Dr Ross Corkrey)
ID Code:39590
Year Published:1996
Web of Science® Times Cited:4
Deposited By:Agricultural Science
Deposited On:2006-06-08
Last Modified:2015-02-06
Downloads:0

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